Abstract
Cationic ultraviolet (UV) coatings were formulated using a cycloaliphatic diepoxide (3,4-epoxycyclohexyl methyl-3′, 4-′epoxycyclohexane carboxylate) with siloxane modified caprolactone polyols. Both di- and tri-TEOS (tetraethyl orthosilicate) functionalized caprolactone polyols were used to modify the UV coatings. The resulting coatings were cured and evaluated in terms of pencil hardness, MEK double rubs, crosshatch/pull-off adhesion, and reverse impact resistance. Addition of the siloxane-functionalized polyols into the caprolactone polyol/cycloaliphatic diepoxide coating formulations improved pencil hardness, MEK double rubs, and enhanced toughness of the coatings. When the addition of siloxane-functionalized polyols was less than 25 wt%, the resulting coatings had significantly increased adhesion. In addition, modification of the coatings with the siloxane-functionalized polyols also reduced surface tension and improved film formation with reduced levels of surface wetting agent. Without the modification, the coatings exhibited a poor balance of hardness and adhesion.
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